The moon jellyfish do not sting, but swimmers can feel them while bathing in the Gulf of Mexico. They range in color from pink to white and have short tentacles.

Scientists say it's too early to know if the jellyfish population has increased in the Gulf. Wind, currents and tides likely brought the jellyfish close to shore. University of Southern Mississippi marine scientist Monty Graham says the jellyfish tend to accumulate along the edges of the shore, which helps them reproduce.